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전자선 처리가 된 고분자 물질을 활용한 자동차 부품에 관한 연구
안희철(Hee Chul An),하동헌(Dong Hun Ha) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The electron beam radiation of polymer materials can bring about various property improvements. The interaction between energized electrons and materials result in valuable reaction being crosslinking. These modifications to the molecular structure are characterized by improvements to the mechanical and physical properties of the polymer materials. Polyamide 12 reinforced with glass fiber tested showed significant changes of thermal stability and mechanical properties after electron beam radiation. The increased properties of polymer materials radiated electron beam is helpful in expanding the applications in automotive industry. This paper discusses the technical advantages and target application of the radiation polyamide 12 reinforced with glass fiber.
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전과정평가(LCA)를 이용한 EPS (Electric Power Steering)에 대한 환경영향 평가 연구
정진원 ( Jin Won Chung ),안희철 ( Hee Chul An ) 한국전과정평가학회 2023 한국전과정평가학회지 Vol.24 No.1
본 연구에서는 원료 채굴 단계부터 제품의 사용 전 단계까지 시스템 경계를 설정한 전동식 조향 장치에 대하여 전과정평가 기법을 적용하여 환경영향을 정량화하였다. 환경성적표지제도에서 고려하는 자원고갈, 산성화, 부영양화, 지구온난화, 오존층고갈, 광화학 산화물생성에 대한 환경영향을 평가하였다. 6개 환경영향 범주에서 원료 채굴 단계가 차지하는 기여도는 자워고갈이 85.2%, 산성화 93.8%, 부영양화 89.7%, 지구온난화 86.3%, 오존층고갈 99.5%, 광화학 산화물은 93.1%로 확인되었다. 연구 결과의 신뢰도를 확인하기 위해 주요 데이터 및 가정에 대해 민감도 분석을 수행하였다. 이 연구 결과를 통해 전동식 조향 장치에서 환경영향이 가장 큰 인자가 원료 채굴 단계이고, 알루미늄 재질의 부품인 것을 확인하였다. This study was quantified using LCA about EPS limited system boundary from raw material extraction until it leaves the factory and assessed six environmental impact categories; Abiotic depletion; Acidification; Eutrophication; Global warming; Ozone layer depletion; and Photochemical oxidants creation. The contributions of raw material extraction to the six environmental impact categories were determined to be as follows:Abiotic depletion 85.2%, Acidification 93.8%, Eutrophication 89.7%, Global warming 86.3%, Ozone layer depletion 99.5%, and Photochemical oxidants creation 93.1%. Sensitivity analysis was performed for data and assumptions to confirm the results reliability of this study. The results of this study confirmed that raw material extraction stage and aluminum material part is the most important environmental impact factors in EPS.
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반도체 메탈공정 및 1차 스크러버에서 생성되는 파우더 부산물의 물리화학적 특성분석
최광민 ( Kwang Min Choi ),정명구 ( Myung Koo Jung ),안희철 ( Hee Chul An ) 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.3
Objectives: The aim of this study is to identify physicochemical properties such as chemical composition, size, shape and crystal structure of powder byproducts generated from a metallization process and its 1st scrubber in the semiconductor industry. Methods: Powder samples were collected from inner chambers during maintenance of the W-plug process equipment (using tungsten hexafluoride as a precursor material) and its 1st scrubber. The chemical composition, size and shape of the powder particles were determined by field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) equipped with an energy dispersive spectroscope (EDS). The crystal structure of the powders was analyzed by X-ray diffraction (XRD). Results: From the SEM-EDS and TEM-EDS analyses, O and W were mainly detected, which indicates the powder byproducts are tungsten trioxide (WO3), whereas Al, F and Ti were detected as low peaks. The powder particles were spherical and nearly spherical, and the particle size collected from the process equipment and its 1st scrubber showed 10-20 nm (agglomerates: 55-90 nm) and 16-20 nm (agglomerates: 80-120 nm) as primary particles, respectively. The XRD patterns of the yellow powder byproducts exhibit five peaks at 23.8 33.9 41.74 48.86 and 54.78 which correspond to the (200), (220), (222), (400), and (420) planes of cubic WO3. Conclusions: We elucidated the physicochemical characteristics of the powder byproducts collected from W-plug process equipment and its 1st scrubber. This study should provide useful information for the development of alternative strategies to improve the working environment and workers`` health.
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